You know you are dealing with a tough crowd when you exceed estimates, guide higher for the future, grow your international bookings 80%, and see your stock price get smashed 17%. This is exactly what happened with Priceline.com (PCLN) after the close today.

The company earned $1.55 per share, much better than the $1.41 expected by Wall Street. Revenues soared 44% to $514 million. PCLN boosted its full-year projections to between $5.50 and $5.85 per share. Analysts currently expect $5.54 per share.

However, investors seem to be focusing on the slight slowdown in growth in its international bookings. This segment has been the main reason that investors have bid up the shares so much, so any sign of a slowdown here is cause for concern. The stock could have further to fall from its after hours quote of $99 since momentum traders might head for the exits.